Pressure Unit Converter (PSI, Bar, MPa...)

Enter a value in any box to automatically convert to the remaining units (PSI, Bar, kPa, MPa, kg/cm²).

Pressure in PSI

PSI

Pressure in Bar

Bar

Pressure in kPa

kPa

Pressure in MPa

MPa

Pressure in kg/cm² (at)

kg/cm²

Pressure in Atm

atm

Common Conversion Formulas:

1 Bar = 14.5038 PSI
1 Bar = 100 kPa = 0.1 MPa
1 Bar = 1.0197 kg/cm²
1 Atm = 1.01325 Bar

Why do we need a pressure conversion table?

In the boiler, pressure vessel, and piping industry, pressure units are often used interchangeably depending on national standards or manufacturers. For example:

PSI (Pounds per Square Inch): UK/US measurement standard, commonly found on ASME standard valves and fittings.
Bar / kg/cm²: The most common unit in Vietnam and Europe, appearing on most boiler pressure gauges.
MPa / kPa: SI standard unit, commonly used in official technical design documents.

This online conversion tool helps engineers save calculation time and avoid errors during technical parameter conversion, contributing to safety in equipment selection and design.

Common Boiler Pressure Quick Reference

Bar	PSI	MPa	kg/cm²	Common Application
5 bar	72.5 PSI	0.5 MPa	5.1 kg/cm²	Wood drying, fabric dyeing
8 bar	116 PSI	0.8 MPa	8.1 kg/cm²	Most common in garment, food processing
10 bar	145 PSI	1.0 MPa	10.2 kg/cm²	Large capacity boilers, long piping
15 bar	217.5 PSI	1.5 MPa	15.3 kg/cm²	Biomass boilers, small power generation

Real-world Application Context

In actual operation, the unit used depends on the equipment and region:

PSI: Commonly found on safety valves and pressure reducing valves imported from the US (ASME standard).
Bar / kg/cm²: Almost 100% of pressure gauges on boilers in Vietnam use this system.
MPa: Used in design documents, P&ID drawings, and safety inspection standards.

Important Technical Notes

Gauge Pressure vs Absolute Pressure:
Actual measuring devices display gauge pressure (Symbol: barg, psig), which is the pressure inside the equipment relative to atmospheric pressure. When looking up the Steam Table, you must add atmospheric pressure (~1 bar) to the measurement to get the absolute pressure.

Boiler Capacity Calculator Saturated Steam Table Products

Frequently Asked Questions (FAQ)

How many PSI is 1 bar?

1 bar is equal to 14.5038 PSI. This is the standard conversion ratio used in the boiler and piping industry.

How many bar is 1 MPa?

1 MPa (Megapascal) is equal to 10 bar. The conversion is simple: MPa = bar / 10.

Are kg/cm² and bar different?

Almost equal in practice. 1 bar = 1.0197 kg/cm². On analog pressure gauges, the bar and kg/cm² markings often overlap.

How many PSI is an 8 bar boiler equivalent to?

An 8 bar boiler is equivalent to approximately 116 PSI (8 x 14.5038). This is the most common pressure for industrial boilers.